Remove impossible condition in get_scalar_constant_value logic

aesara/tensor/basic.py

@@ -441,23 +441,9 @@ def get_scalar_constant_value(
                     and isinstance(v.owner.inputs[0].owner.op, Join)
                     and len(v.owner.op.idx_list) == 1
                 ):
-                    # Ensure the Join is joining only scalar variables (so that
-                    # the constant value can be found at the same index as the
-                    # one used in the sub-tensor).
-                    if builtins.all(
-                        var.ndim == 0 for var in v.owner.inputs[0].owner.inputs[1:]
-                    ):
-                        idx = v.owner.op.idx_list[0]
-                        if isinstance(idx, Type):
-                            idx = get_scalar_constant_value(
-                                v.owner.inputs[1], max_recur=max_recur
-                            )
-                        # Note the '+ 1' is because the first argument to Join
-                        # is the axis.
-                        ret = v.owner.inputs[0].owner.inputs[idx + 1]
-                        ret = get_scalar_constant_value(ret, max_recur=max_recur)
-                        # join can cast implicitly its input in some case.
-                        return _asarray(ret, dtype=v.type.dtype)
+                    # Ensure the Join is joining only (effectively) scalar
+                    # variables (so that the constant value can be found at the
+                    # same index as the one used in the sub-tensor).
                     if builtins.all(
                         var.ndim == 1 for var in v.owner.inputs[0].owner.inputs[1:]
                     ):